X0306 4 2021-05-10 0 0000016040 CABOT CORP CBT 0001778734 Kalita Karen A C/O CABOT CORPORATION TWO SEAPORT LANE, SUITE 1400 BOSTON MA 02210 0 1 0 0 SVP and General Counsel Common Stock 2021-05-10 4 M 0 6862 40.91 A 21687 D Common Stock 2021-05-10 4 S 0 5533 62.717 D 16154 D Common Stock 2021-05-10 4 M 0 5898 50.23 A 22052 D Common Stock 2021-05-10 4 S 0 5224 62.97 D 16828 D Common Stock 540.216 I Through the Trustee for the Corporation's 401(k) Plan Stock Options 40.91 2021-05-10 4 M 0 6862 0.00 A 2029-06-02 Common Stock 6862 4575 D Stock Options 50.23 2021-05-10 4 M 0 5898 0.00 A 2029-11-07 Common Stock 5898 13764 D Consists of shares sold to cover stock option exercise price and taxes due upon exercise of such stock options; balance of shares issued upon exercise of stock options were held. The price reported is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $62.67 to $62.74, inclusive. The reporting person undertakes to provide to the staff of the Securities and Exchange Commission, the Corporation or any security holder of the Corporation, upon request, full information regarding the number of shares sold at each separate price. Consists of shares sold to cover stock option exercise price and taxes due upon exercise of such stock options; balance of shares issued upon exercise of stock options were held. The price reported is a weighted average sale price. The price reported is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $62.92 to $62.99, inclusive. The reporting person undertakes to provide to the staff of the Securities and Exchange Commission, the Corporation or any security holder of the Corporation, upon request, full information regarding the number of shares sold at each separate price. 11,437 shares were subject to the option. The option vests over a three year period as follows: 30% on November 9, 2019, 30% on November 9, 2020 and 40% on November 9, 2021. 19,662 shares were subject to the option. The option vests over a three year period as follows: 30% on November 8, 2020, 30% on November 8, 2021 and 40% on November 8, 2022. By: Jennifer Lombardi, pursuant to a power of attorney from Karen A. Kalita 2021-05-12